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10 Year Longlife Battery Carbon Monoxide Alarm - FireAngel FA3820

fireangel carbon monoxide alarm 10yr long life battery shown from the front with test button and indicator lights
4.8 out of 5 stars

20+ In Stock

For dispatch today order within
13 Hrs 49 Mins
£28.34 inc VAT

£25.79 inc VAT

£21.49 ex VAT

Standard Delivery

Will usually be delivered in 2-3 working days

£4.20 inc VAT

Next Day Delivery

Will usually be delivered the next working day

£7.00 inc VAT

Featuring easy to read LED status indicators, the FireAngel FA3820 carbon monoxide alarm is powered by a 10 year sealed lithium battery and is certified for use in your home or whilst travelling. Unlike other CO alarms, the FA3820 features a pre-alarm warning which encourages ventilation of your property when low levels of carbon monoxide are detected. The combined test / hush button allows for low volume weekly testing, and the Sleep Easy function can silence low battery / end of life warning chirps for up to 8 hours with a single button press.

  • Product Lifespan: 10 years
  • Battery: 10 year sealed lithium battery
  • Warranty: 5 year warranty
  • Designed for wall mounting or free standing installation
  • Certified for the home, caravans, motor homes, and boat use
  • Loud 85dB audible alarm activates when CO level reaches 50ppm
  • 'Pre-alarm' warning encourages ventilation of property when low levels of CO are detected
  • Kitemarked to BS EN 50291-1: 2018 (domestic use) and BS EN 50291-2: 2019 (camping / caravans / boats)
  • CE marked and UKCA marked
  • Low volume test function
    • Single press - self-test at a reduced volume
    • Double press - self-test at full alarm volume
  • Silence low battery / end of life warnings with the Sleep Easy function for up to 8 hours
  • Simple activation with the removal of the disabling tab
  • Indicates previous alarm activation with memory function
  • Dimensions (HxWxD): 67 x 125 x 33mm
  • This alarm is also suitable for both the Welsh and Scottish updated 2022 legislation

Please note: Rawl plugs and screws are not included. Alternative methods for wall mounting are available including self-adhesive pads.

Key Product Features

Close-up of the button on the fireangel carbon monoxide alarm 10yr long life battery showing test label and central press area

Single press for a low volume test, double-press for full volume

Close-up detail of FireAngel carbon monoxide alarm 10yr long life battery showing logo and control icons

Separate Ventilate, CO Alarm, Fault, and Power indicators

Back view of a fireangel carbon monoxide alarm 10yr long life battery showing fixing slot and warning labels

Certified for home, caravans, motor homes, and boat use

Close-up of the sounder part of the fireangel carbon monoxide alarm 10yr long life battery showing logo and vents

'Pre-alarm' warning encourages ventilation at low levels of CO

What's Included?

The FireAngel FAFA3820 is supplied with the following components.

  • 1 x FireAngel FA3820 CO alarm
  • 1 x Sealed lithium battery
  • 1 x Screw fixing set (screws & rawl plugs)
  • 1 x Instruction manual
FA3820 Dimensions
Customer Reviews

Customer Reviews (11)

4.8 out of 5 stars

Reviews by Real Customers

All of our product reviews are written by real customers that have purchased this product from us and are published without modification.

Rating: 5 / 5

Reviewed by

G H

Published on

10th November 2025

The product is well made to a good quality. It was easy to install and set up.

Product arrived in good time and was well packaged for posting.

Rating: 5 / 5

Reviewed by

P G

Published on

9th April 2024

All OK so far

Needed a Carbon Monoxide Alarm, found this and all seems good so far, no issues.

Rating: 5 / 5

Reviewed by

J G

Published on

7th April 2024

Small clean design good packaging

Rating: 5 / 5

Reviewed by

G H

Published on

5th February 2024

Works well and is attractively designed.

Rating: 5 / 5

Reviewed by

J B

Published on

14th January 2024

Neat, inconspicuous and easy to use.

FAQs

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Technical Data

Technical Data

Product Code FAFA3820
Brand FireAngel
Approvals & Markings CE Marked
UKCA Marked
Battery Type Sealed Lithium
CO Alarm Level (parts per million) From 50ppm
CO Detection Level (parts per million) From 10ppm
Colour White
Compliance BS EN 50291-1 (Domestic)
BS EN 50291-2 (Caravans / Boats / Travel)
Connection Standalone
Display LED Indicators
Environmental Suitability Caravan, Camping & Boats
Home
Travel
Fixing Options Freestanding
Wall Mounted (Fixings Included)
Installation Position Mount At Head Height
Local Legislation Scottish Legislation (2022)
Welsh Legislation (2022)
Material Plastic
Operating Temperature -10°C To +40°C
Power Type Battery Powered
Recyclable Yes - Valpak's WEEE Distributor Take-back Scheme
Relative Humidity 30% To 90%
Sensitivity 10ppm (Parts Per Million)
Sensor Type Electro-chemical
Sound Level 85dB
Warning Type Audible - Alarm Sounder
Warranty 5 Years
Lifespan 10 Years
Dimensions (Unit)
  • Height: 67mm
  • Width: 125mm
  • Depth: 33mm
Weight 95g
Datasheets